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the horn is located under the passenger side fron fender there is a plastic inner fender that needs to be removed to access the horn
The 2005 Ford F3 50 horn fuse can be found in the fuse box. The horn fuse will be in the second column, fourth from the top.
with a wrench
Yes there is a relay, it is located in the main fuse panel fwd of the pass door, But is is not replaceable. now why would ford make a relay that you can't replace?
You can replace the standard car horn with pretty much any horn you want. Given that many truck horns are powered by air, it would be difficult to duplicate in a car unless you can rig an air compressor.
Replace the horn relay. It is defective. Another possibility is a defective horn switch, but highly unlikely.
ford freestar 2005 how Change airbig
What relay are you trying to replace? (what does it operate?) horn
Check the Horn wiring and if this is good then replace the horn.
behind front grill area
check fuse then relay then ground
Fuse number 37 under you dash.